Planting Technology Lists
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Black spot of rhododendron
Rhododendron black spot, also known as brown spot, is a common multiple leaf spot disease of rhododendron. After the disease, the leaves formed black spots, which gradually dried up and fell off until the plant died. The disease mainly harms the leaves of rhododendron, which is infected by Cercospora rhododendron fungi, and several brown spots begin to appear. With the continuous expansion of the spots, the disease spots connect with each other and produce gray-brown fungal hyphae, and the damaged leaves start from the petiole and fall off early from green to brown, which seriously affects the growth, development and ornamental value of rhododendron. The pathogen overwinters on leaves or diseased plants.
2019-01-16 -
Control methods of black spot of Magnolia
The main results are as follows: (1) strengthen the nursery management, enhance the tree potential and improve the disease resistance. Select loose, fertile and well-drained soil, apply fully rotten cake fertilizer, loosen the soil and water in time, and pay attention to frost prevention in the north. (2) remove the fallen leaves on the ground in time, cut off the seriously diseased leaves from the trees, and concentrate on burying them deeply. (3) at the initial stage of the disease, spraying 1purl 160 Bordeaux solution or 0.3~0.5Be stone sulfur mixture 77% could kill wettable powder, 30% Wang copper suspension, 25% complex ammonia copper water, 50% bacilli special wettable powder 6.
2019-01-16 -
Prevention and control techniques of black spot of rose
Rose black spot occurs in many places. The disease harms the rose, makes the leaves withered and yellow, falls early, causes the second leaf of the rose in the same year, weakens the growth potential of the plant and reduces the yield of cut flowers. First, the symptoms of rose black spot mainly affect the leaves, but also affect the petiole, leaf veins, shoots and other parts. In the early stage of the disease, small brown spots appeared on the front of the leaves, which gradually expanded into round, round or irregular spots. The lesion is 2-12 mm in diameter, dark purple and radiating at the edge. In the later stage, the central tissue of the lesion became gray and white, and a lot of black was scattered on it.
2019-01-16 -
Identification and control of black spot of rose
The disease is common and does serious harm, resulting in a large number of fallen leaves of rose and huge losses. The pathogen is a fungus of the genus Actinomyces. First, at the beginning of symptom recognition, brown radial disease spots appear on the leaf surface, and then gradually expand into round or near-round disease spots, with a diameter of 412 mm; in severe cases, the lower leaves fall off in the early stage, gradually spread upward, and eventually the upper leaves will lose light. Rainy and humid is the main condition for spore production, there are water droplets on the leaf surface, and at the appropriate temperature, it can invade in 6 to 10 hours and appear symptoms in 3 to 6 days.
2019-01-16 -
Common diseases and insect pests of rhododendron and their control
Rhododendron is mainly for ornamental use, and has strong vitality and is easy to plant. Cuckoos have four love and five fear habits, that is, love semi-shade, love cool, love moist, love acid soil; afraid of hot sun, afraid of heat, afraid of thick fat, afraid of soot, afraid of sulking. This paper introduces the common diseases and insect pests and their control methods; (1) rhododendron disease. In the process of cuckoo growth, the diseases on the leaves can be divided into two types: physiological diseases and pathological diseases. (1) physiological diseases. In the process of cuckoo growth, iron deficiency often occurs if there is a lack of trace element iron.
2019-01-16 -
Common diseases and insect pests of rhododendron
Rhododendron black spot, also known as brown spot, is a common multiple leaf spot disease of rhododendron. After the disease, the leaves formed black spots, which gradually dried up and fell off until the plant died. The disease mainly harms the leaves of rhododendron, which is infected by Cercospora rhododendron fungi, and several brown spots begin to appear. With the continuous expansion of the spots, the disease spots connect with each other and produce gray-brown fungal hyphae, and the damaged leaves start from the petiole and fall off early from green to brown, which seriously affects the growth, development and ornamental value of rhododendron. Pathogens on leaves or diseased plants
2019-01-16 -
Common diseases and insect pests of African violets and their control
1. Disease 1. Ringspot disease this is a disease caused by a virus, which is generally spread by thrips, and the leaves will produce ring markings after they are infected with the virus. Through the prevention and control of thrips to prevent the occurrence of virus disease, which is the main measure to control ring spot disease. Infected plants, generally there is no cure, can only be removed and destroyed. 2. Leaf spot is a leaf disease caused by fungi, which occurs first in the lower leaves of the plant, especially on the leaves that are damaged or in contact with the substrate. In the early stage of the disease, damage occurs on the leaves.
2019-01-16 -
Pollution-free Prevention and Control of Diseases and insect pests in Bonsai plants
Alcohol smearing method gently smears the leaves of orchids with scale insects with disinfectant alcohol, which can kill them, and there will be few damage caused by scale insects the following year. After soaking cotton balls in edible vinegar (rice vinegar), gently daubing camellias leaves can not only kill shell insects, but also make the leaves affected by insect pests return green. Iodine smearing method when it is found that the tree stump bonsai is dry and rotten, immediately scrape off all the rotten parts with a razor blade wiped with iodine, reaching to the xylem, and then smear iodine on the trunk for a week.
2019-01-16 -
Pest control techniques of Phalaenopsis
Disease: Phalaenopsis is native to trees in the tropical rain forest. it not only grows vigorously, but also rarely infects diseases, and the most important disease is blight, which is caused by a fungus that invades the tissue of the plant leaves and divides and propagates in the tissue, destroying the cells of the tissue, and the rate of division and reproduction of this fungus is so amazing that it is enough to destroy a robust plant in a short period of 24 hours. The fungi that can infect Phalaenopsis plants are ⑴ PhytophthoraPalmivora ⑵ Phytoph.
2019-01-16 -
Pest control of Phalaenopsis
Pest control is an important link in the successful cultivation of Phalaenopsis. Disease prevention is a regular work, the cultivation environment must be well ventilated, the plant material and air humidity are suitable, and Bordeaux liquid, chlorothalonil and Haoshengling are sprayed regularly to prevent the disease. -apply pesticides in time to prevent and control diseases and insect pests. Main diseases and control: 1. Petal Botrytis cinerea: black mildew spots grow on the petals, and mycelium can be seen on the moldy spots. 2. Anthrax: large dark brown or light brown oval or amorphous disease spots grow on the leaves.
2019-01-16